import unittest
def summ(a,b):
	return a+b

def resta(a,b):
        return a-b
def divicion(a,b):
        return a/b
def multiplicar(a,b):
        return a*b
class testsumm(unittest.TestCase):
	def test(self):
		self.assertEqual(summ(4,5),9)
class testresta(unittest.TestCase):
        def test(self):
                self.assertEqual(resta(5,4),1)
class testdivicion(unittest.TestCase):
        def test(self):
                self.assertEqual(divicion(4,2),2)
                
class testmultiplicacion(unittest.TestCase):
        def test(self):
                self.assertEqual(multiplicar(2,2),4)
if __name__=="__main__":
	unittest.main()

